Cybersyn Combinator (2.7.1)のMODが回復不能なエラーを発生させました。
MOD作成者にこのエラーを報告してください。

Error while running event cybersyn-combinator::on_gui_elem_changed (ID 79)
2番目のフィルターと競合します。
stack traceback:
[C]: in function 'set_slot'
cybersyn-combinator/scripts/combinator.lua:398: in function 'set_item_slot'
cybersyn-combinator/scripts/gui.lua:584: in function 'handler'
flib/gui.lua:177: in function <flib/gui.lua:160>

Based on Google translate, it seems it's incorrectly allowing a duplicate signal to be set, somehow.

What signals are already set in the combinator, and what is the signal you are trying to add when the error happens? (If you have a savefile and reproduction steps that would also be helpful.)

I'm going to assume that this was the same issue as in GitHub issue #54 and should thus be fixed in v2.7.3. If that's not the case, let me know!